(1) Extract mask and orog from file

cdo selname,time,grid_xt,grid_yt,land gdas.t00z.sfcf000.nc c384_mx025_mask_2davr.nc

cdo selname,time,grid_xt,grid_yt,orog gdas.t00z.sfcf000.nc c384_mx025_orog_2davr.nc


